Thanx to all of you who responded to my post.
The same over here, I am waiting to get the ATH-A900X (closed back) for under $150.
Let me stress that I'll be listening to music (no gaming at all) in very quiet environments:
1. in a quiet room at home
2. in a quiet library
3. in a quiet coffee shop
So, I am not interested noise isolating (from the outside world) headphones.
Now, I've forgot to mention that I want circumaural (and not over-ear like Grados) headphones that would be in the same league - if possible -
with my Beyerdynamic DT 880 (250 Ohm) or Sennheiser HD 595 (50 Ohm).
(I'm using the ODAC and the O2 as two separates.)
As I've read in this thread or on this site:
The Sony open air/back M900 are leaking sound, the new open back ATH AD-900X are leaking sound as well.
So, I am left with the AKG K 550 (closed back) and A900X (closed back).
Now, the differnce in cost between the K 550 and A900X is about $100,
but I guess that the K 550 are perhaps in the same league with my DT 880 wheras the A900X are not.
Well,I think that I might go for the under $150 A900X for listening in quiet indoors environments.
Well, the ATH-WS99 are over-ear, so probably they do leak sound like Grados.
Plus I don't like the discomfort of over-ear cans.
I am not excluding them from my considerations yet.
Edited by JakeJack_2008 - 5/15/13 at 7:36pm